The conception and results of modernization of the EUV radiation spectrometer for use in the Solar Patrol Mission in the framework of Russian project. 'The creation of permanent space patrol of soft X-ray and hard UV solar radiation' are presented. The EUV spectrometer is one of three devices developed for the above patrol together with soft X-ray and EUV radiometer and spectrometer. The main purpose of the Solar Patrol Mission is the permanent monitoring of the solar activity including the periods of solar flares which will allow the variation of absolute fluxes of ionizing radiation and its spectral composition to be determined. These data are of great importance for solving the problems for solar- terrestrial relations.